There are several target functions you can choose

There are several target functions you can choose depending upon the analysis mode of theoptimization (DC or AC).For DC optimization problems, you’ll need DC goal functions. When you click on a meter with thespecial target selectorcursor, a dialog box appears showing several goal functions:Click on the DC Goal Functions… button. Another dialog box appears which allows you to set a DCgoal function:

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To optimize to a target Value, enter the desired value. To optimize to a Maximum or Minimum,select the appropriate option.For AC optimization problems, you’ll need AC goal functions. With a meter selected, click on theAC Table… or on the AC Goal Functions… button. The AC Table supports a special AC goal functiondefined by a series of frequency and amplitude values. Using these frequency-amplitude pairs, an ACtransfer function can be defined.You can access other AC goal functions by pressing the AC Goal Functions… button. Here you’llfind Center Frequency, High Pass, Band Pass, and Low Pass target functions, as well as Minimum andMaximum target functions. You can combine these functions, effectively setting more than onecriterion.Now that you have established the target details, you must identify the control object(s) and theirparameter(s) to be determined by optimization. To select a component, click on the Analysis.ControlObject menu item or on the Select Control Object speed button . A special cursor willappear in the schematic editor window, waiting for you to identify the component to which the

optimized parameter belongs. If you want TINA to optimize using more than one component, repeatthe procedure for the other components.When you point at the component and click, TINA will display all of its associated parameters in adialog window.Highlight the parameter to be determined by the optimization process, press the Select button, andenter the Start and End values for the variation of this component’s value.If the desired parameter belongs to a catalog component, or if it is an excitation attribute, you mustfirst select the semiconductor or waveform type so that you can access the appropriate data sheet.The selected parameter will be varied in the range between the Start and End values while TINAsearches for the optimum result at the target. If no optimum is found, then the range will have to beenlarged. If there is more than one optimum case in the range, TINA will only find one of them. If yoususpect that this is the case, try using multiple, narrower ranges, each of which has one or feweroptimums.You can use the Remove button to deselect a previously assigned control object or optimizationtarget.Optimization is useful not only in the design of electronic circuits, but in teaching, where you can useit to construct examples and problems. Let us see some examples.

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Two examplesExample 1: Differential Amplifier (DC Optimization)This example illustrates how to use the DC Optimization to set the operating point of a differentialamplifier.

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